Maybe something a little different to add to your sites - I've put together 3 ebooks on .. well .. sex. It's from a woman's point of view which is a great way to market them.
http://www.womenssecrets.com
It is a 50/50 affiliate program - and the affiliate sign up page is located here
http://www.womenssecrets.com/affiliates.htm
Related sites that you could get copy from
http://www.esinsuals.com
http://www.hedoesshedoes.com
http://www.goodsexkeeping.com